New narrow resonances observed in the unbound nucleus F15

The unbound nucleus ${}^{15}$F was studied in proton-induced reactions on ${}^{14}$O, producing three narrow resonances above the 2$p$ decay threshold in ${}^{15}$F. In comparison to calculations that account for the particle continuum, it was found that the properties of these resonances are determined by the proximity to proton decay channels rather than by carrying the imprint of ${}^{14}$O$({0}^{+})+1p$ configurations. Systematic investigations of such narrow resonances in unstable nuclei will open new perspectives in studies of effective interactions in nuclear open quantum systems.